mud_digger

I got an 89 with 4.0 and a 8" lift on 35s. I will be using it as my dd. 99% of my driving will be 55-60mph with some once and awhile wheeling. what gearing should I use? I heard it depends on what kinda driving u do

SeriousOffroad

http://www.grimmjeeper.com/gears.html

xj101

id go with 456 or 488 on 35's but thats just me, i like slow by 4's . or gear chart it ^ thanks to frankz.

N20jeep

i would say nothing less than 4.56's-4.88's


but, some people on here will tell you you're better off with 3.07's...lol

jfiedler

4.56 or 4.88 will bring you back to around stock

jfiedler

all the info you will need.....


https://www.cherokeeforum.com/f59/ge...e-chart-67989/

Rock Toy

Frankz, link is the best, it lets you plug in the OD ratio where the chart above is for a 1 to 1 transmission ratio.

mud_digger

it won't let me do frankz chart. can somebody do it for me angsee what it says. wat info do u need from me to do it?

SeriousOffroad

Simply use the pull-down menus and click on the applicable item for your rig. Click on the CALCULATE button and review the info that is available at the bottom of the page.

mud_digger

can't do it from my cell and I dint have a pc

Rock Toy

Use this formula!
MPH x rear gear ratio x 336 / tire height x top transmission gear = rpms at given speed

Automatic trans OD ratio is .75

5 speed OD ratio is .79

This should do it for you Mud_digger.

mud_digger

thanks rock toy

mud_digger

so a guy here that's local as an 8.25 with 4.10 gears, disc brakes, and a detroit trutrac limited slip as well as the matching d30 4.10 gears. all for $300. should I just go and get that rather than buy 4.56 gears and then have to pay to have them installed?

N20jeep

Go for it

Rock Toy

That sounds like a great buy, the trutrac is a torque biasing differential and doesn't use clutch discs like a limited slip differential. It uses gears to transfer I think up to 40 percent of the torque to the axle with the most traction.
If the 8.25 is a 29 spline you have everything needed to do your Cherokee and then you could sell your old axles or use the shafts for spares. The 4.10s should work ok, the 4.56s would probably be better, but for the cost I would go with the 300.00 deal.